Process of manufacturing masses for use in making artificial threads and the like.



UNITED STAIF a'r rion.

RUDOLF LINKMEYER, OF BREMEN, GERMANY.

PROCESS OF MANUFACTURING MASSES FOR USE IN MAKING ABTIFICIAL THREADS AND THE LIKE. I

F0 Drdiflng. I Application filed March 2 p i n emcee nt Patented Dec. 20, 1910.

e, was. SeriaINo. 486,572.

To all whom iii-may concern:

Be it known that I, Runonr- Lmniim' nn, a subject of the German Emperor, and resrdent at Bremen, Germany, have invented a i new and useful Improved Process of Manufacturing Masses for Use in Making Artificial Threads and the Like, of which the following is a specification. y

The subject-matter of my invention 1s an improved process of manufacturing d ssolved masses for use in making artificial threads or filaments.

In a former application Serial Number 482,001, filed March 8, 1909, I have described a process, on which my present process is an improvement. Namely, according to the.

older process pure cellulose is dissolved to which, after it has been dissolved, are added other carbohydrates such'as sugar, gliadm or various kinds of gums.

, Now I have found that solutions having the same valuableproperties as those obtained by the procem above referred to can be made by such materials being'employed for the solution which containsboth cellulose and carbo-hydrates. I have also found that the vegetable parts, which if possible contain no pigments or coloring matters and as few kin s of albumen as possible, are most suited for the process according to my present invention. This is true generally in the case of plants about one year old or the new growth of trees These young parts of lants contain, as is known from various publications, besides already formed cellulose much hemi-cellulose in addition and other carbohydrates such as kinds of gums The best results were obtained with rice hulls such as are. obtained as a waste product when rice is hulled. I

have found, further, that by treatment with chemical reagents, e g.. by boiling and bleaching, that part of the extraction material which is. not bound so firmly with the raw fiber, is removed, whereas a large part of the same, namely the portion which is more valuable for the later products, remains bound to the fiber, but is dissolved with the cellulose when the solution is being made I and is separated .out again in the filaments or threads.

An example for carrying the invention l into practice will now be given! Rice hulls, l for example, are boiled down from 12 to 18 hours with an addition of a small amount of alkalies or with an alkaline carbonate the same are then bleached white and without destroying the carbohydrates and then well washed. The hulls prepared in this manner are then placed into cupro-animonium solution, as descrihed in my previously mentloned former application, for the purpose of dissolving them which is efiectcd coinpletely after a short time. The solution thus obtained has the same property as those made according to my former application above referred to. The commercial value ofthese hulls which Were-hardly used at all heretofore is so small that it eguals only the fortieth part'of the value 0. raw cotton. This circumstance, and the fact that the solution has attached to it specially good prop threads or filaments, render the employment of this material. specially advantageous and consequently characterize exceedingly important industrial progress in the branch of industry in question. i

I claim:

1. The recess for the manufacture of artificial t reads of high gloss and great strength vwhich comprises treating young plant parts lcontaining hemi-cellulose and other carbohydrates with a solution of cuproammonium and forming threads from such solution while maintaining therein the hemicellulose and other carbohydrates.

- 2. .The process of producing dissolved substances for making artificial threads of high gloss and great strength, which comprises cleaning and'bleaching those young parts of plants or vegetable matter which contain in addition to cellulose a large percentage while maintaining the carbohydrates, hemithe -'plants or vegetables thus treated in solvents employed as reagents for pure cell lulose to obtain a solution containing cellulose, hemi-cellulose and other carbohydrates. 3. The process of producing cellulose '2 solutions which comprises treating vegetable matter containing cellulose, hemi-cellulose cellulose and cellulose intact and dissolving erties for the 'manufacture of artificial of othercarbohydrates and hemi-cellulose and carbohydrates with a weak alkaline solu- 

